6-Inch 6-Cavity VHF Duplexer (BR)

136-175 MHz, 350 W, 60 dB ±1 MHz @ 500 kHz separation, 2.0 dB IL @ 1 MHz. All-band-reject 6 cavity.

Frequency

136–175 MHz
Power

35 W
Isolation

> 6 dB
Insertion loss

< 2 dB
Connector

N-Female
Weight

30 kg

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Specifications

Electrical

Frequency range	136–175 MHz
Power handling	35 W
Insertion loss	<2 dB
Tx-Rx isolation	>6 dB
VSWR (max)	1.5
Impedance	5 Ω

Mechanical

RF connectors	N-Female
Weight	30 kg
Dimensions (H × W × D)	850 × 511 × 411 mm

Configuration

Cavity Count	6
Cavity Topology	6 BR
Cavity Diameter Inch	6
Separation Min Khz	500
Frequency Stability	0.8 ppm/°C
Temperature Range	-30°C to +60°C
Mounting	19-inch rack

Verified 2026-05-06 · ALUNOR RF Engineering · source: ALUNOR RF Technical Catalogue 2026-01-21

All measurements at 25 °C, 50 Ω, unless otherwise noted.

Why this product

01

6 BR cavities for 350 W continuous-duty handling
02

Flatter passband response than BPBR variant — preferred where Tx-Rx separation is wide
03

Same chassis footprint as VHF-DP-6-6 — drop-in for existing 6-inch racks

Technical brief

All-band-reject topology

Six band-reject cavities — no pass cavities. This trades some peak isolation for higher continuous power handling (350 W) and a flatter passband. Suited to systems where Tx-Rx separation is wider (≥ 1 MHz) and the operator prefers a less peaked response.

Insertion loss vs. separation

At 1 MHz separation, IL is 2.0 dB; at wider separations the IL falls toward the back-of-cavity floor. 60 dB suppression at the carrier ±1 MHz, measured at 500 kHz Tx-Rx separation.

Solves these problems

Eliminating RF interference between co-located VHF radios

Two or more VHF transmitters and receivers operating from the same site or tower interfere with each other through desense, intermodulation, and adjacent-channel leakage.